Merge tag 'ecryptfs-3.12-rc1-crypt-ctx' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mfd / ab3100-core.c
1 /*
2  * Copyright (C) 2007-2010 ST-Ericsson
3  * License terms: GNU General Public License (GPL) version 2
4  * Low-level core for exclusive access to the AB3100 IC on the I2C bus
5  * and some basic chip-configuration.
6  * Author: Linus Walleij <linus.walleij@stericsson.com>
7  */
8
9 #include <linux/i2c.h>
10 #include <linux/mutex.h>
11 #include <linux/list.h>
12 #include <linux/notifier.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/interrupt.h>
19 #include <linux/random.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/uaccess.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/ab3100.h>
25 #include <linux/mfd/abx500.h>
26
27 /* These are the only registers inside AB3100 used in this main file */
28
29 /* Interrupt event registers */
30 #define AB3100_EVENTA1          0x21
31 #define AB3100_EVENTA2          0x22
32 #define AB3100_EVENTA3          0x23
33
34 /* AB3100 DAC converter registers */
35 #define AB3100_DIS              0x00
36 #define AB3100_D0C              0x01
37 #define AB3100_D1C              0x02
38 #define AB3100_D2C              0x03
39 #define AB3100_D3C              0x04
40
41 /* Chip ID register */
42 #define AB3100_CID              0x20
43
44 /* AB3100 interrupt registers */
45 #define AB3100_IMRA1            0x24
46 #define AB3100_IMRA2            0x25
47 #define AB3100_IMRA3            0x26
48 #define AB3100_IMRB1            0x2B
49 #define AB3100_IMRB2            0x2C
50 #define AB3100_IMRB3            0x2D
51
52 /* System Power Monitoring and control registers */
53 #define AB3100_MCA              0x2E
54 #define AB3100_MCB              0x2F
55
56 /* SIM power up */
57 #define AB3100_SUP              0x50
58
59 /*
60  * I2C communication
61  *
62  * The AB3100 is usually assigned address 0x48 (7-bit)
63  * The chip is defined in the platform i2c_board_data section.
64  */
65 static int ab3100_get_chip_id(struct device *dev)
66 {
67         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
68
69         return (int)ab3100->chip_id;
70 }
71
72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
73         u8 reg, u8 regval)
74 {
75         u8 regandval[2] = {reg, regval};
76         int err;
77
78         err = mutex_lock_interruptible(&ab3100->access_mutex);
79         if (err)
80                 return err;
81
82         /*
83          * A two-byte write message with the first byte containing the register
84          * number and the second byte containing the value to be written
85          * effectively sets a register in the AB3100.
86          */
87         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
88         if (err < 0) {
89                 dev_err(ab3100->dev,
90                         "write error (write register): %d\n",
91                         err);
92         } else if (err != 2) {
93                 dev_err(ab3100->dev,
94                         "write error (write register) "
95                         "%d bytes transferred (expected 2)\n",
96                         err);
97                 err = -EIO;
98         } else {
99                 /* All is well */
100                 err = 0;
101         }
102         mutex_unlock(&ab3100->access_mutex);
103         return err;
104 }
105
106 static int set_register_interruptible(struct device *dev,
107         u8 bank, u8 reg, u8 value)
108 {
109         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
110
111         return ab3100_set_register_interruptible(ab3100, reg, value);
112 }
113
114 /*
115  * The test registers exist at an I2C bus address up one
116  * from the ordinary base. They are not supposed to be used
117  * in production code, but sometimes you have to do that
118  * anyway. It's currently only used from this file so declare
119  * it static and do not export.
120  */
121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
122                                     u8 reg, u8 regval)
123 {
124         u8 regandval[2] = {reg, regval};
125         int err;
126
127         err = mutex_lock_interruptible(&ab3100->access_mutex);
128         if (err)
129                 return err;
130
131         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132         if (err < 0) {
133                 dev_err(ab3100->dev,
134                         "write error (write test register): %d\n",
135                         err);
136         } else if (err != 2) {
137                 dev_err(ab3100->dev,
138                         "write error (write test register) "
139                         "%d bytes transferred (expected 2)\n",
140                         err);
141                 err = -EIO;
142         } else {
143                 /* All is well */
144                 err = 0;
145         }
146         mutex_unlock(&ab3100->access_mutex);
147
148         return err;
149 }
150
151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
152                                              u8 reg, u8 *regval)
153 {
154         int err;
155
156         err = mutex_lock_interruptible(&ab3100->access_mutex);
157         if (err)
158                 return err;
159
160         /*
161          * AB3100 require an I2C "stop" command between each message, else
162          * it will not work. The only way of achieveing this with the
163          * message transport layer is to send the read and write messages
164          * separately.
165          */
166         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
167         if (err < 0) {
168                 dev_err(ab3100->dev,
169                         "write error (send register address): %d\n",
170                         err);
171                 goto get_reg_out_unlock;
172         } else if (err != 1) {
173                 dev_err(ab3100->dev,
174                         "write error (send register address) "
175                         "%d bytes transferred (expected 1)\n",
176                         err);
177                 err = -EIO;
178                 goto get_reg_out_unlock;
179         } else {
180                 /* All is well */
181                 err = 0;
182         }
183
184         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
185         if (err < 0) {
186                 dev_err(ab3100->dev,
187                         "write error (read register): %d\n",
188                         err);
189                 goto get_reg_out_unlock;
190         } else if (err != 1) {
191                 dev_err(ab3100->dev,
192                         "write error (read register) "
193                         "%d bytes transferred (expected 1)\n",
194                         err);
195                 err = -EIO;
196                 goto get_reg_out_unlock;
197         } else {
198                 /* All is well */
199                 err = 0;
200         }
201
202  get_reg_out_unlock:
203         mutex_unlock(&ab3100->access_mutex);
204         return err;
205 }
206
207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
208                                       u8 *value)
209 {
210         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
211
212         return ab3100_get_register_interruptible(ab3100, reg, value);
213 }
214
215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
216                              u8 first_reg, u8 *regvals, u8 numregs)
217 {
218         int err;
219
220         if (ab3100->chip_id == 0xa0 ||
221             ab3100->chip_id == 0xa1)
222                 /* These don't support paged reads */
223                 return -EIO;
224
225         err = mutex_lock_interruptible(&ab3100->access_mutex);
226         if (err)
227                 return err;
228
229         /*
230          * Paged read also require an I2C "stop" command.
231          */
232         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
233         if (err < 0) {
234                 dev_err(ab3100->dev,
235                         "write error (send first register address): %d\n",
236                         err);
237                 goto get_reg_page_out_unlock;
238         } else if (err != 1) {
239                 dev_err(ab3100->dev,
240                         "write error (send first register address) "
241                         "%d bytes transferred (expected 1)\n",
242                         err);
243                 err = -EIO;
244                 goto get_reg_page_out_unlock;
245         }
246
247         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
248         if (err < 0) {
249                 dev_err(ab3100->dev,
250                         "write error (read register page): %d\n",
251                         err);
252                 goto get_reg_page_out_unlock;
253         } else if (err != numregs) {
254                 dev_err(ab3100->dev,
255                         "write error (read register page) "
256                         "%d bytes transferred (expected %d)\n",
257                         err, numregs);
258                 err = -EIO;
259                 goto get_reg_page_out_unlock;
260         }
261
262         /* All is well */
263         err = 0;
264
265  get_reg_page_out_unlock:
266         mutex_unlock(&ab3100->access_mutex);
267         return err;
268 }
269
270 static int get_register_page_interruptible(struct device *dev, u8 bank,
271         u8 first_reg, u8 *regvals, u8 numregs)
272 {
273         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
274
275         return ab3100_get_register_page_interruptible(ab3100,
276                         first_reg, regvals, numregs);
277 }
278
279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
280                                  u8 reg, u8 andmask, u8 ormask)
281 {
282         u8 regandval[2] = {reg, 0};
283         int err;
284
285         err = mutex_lock_interruptible(&ab3100->access_mutex);
286         if (err)
287                 return err;
288
289         /* First read out the target register */
290         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
291         if (err < 0) {
292                 dev_err(ab3100->dev,
293                         "write error (maskset send address): %d\n",
294                         err);
295                 goto get_maskset_unlock;
296         } else if (err != 1) {
297                 dev_err(ab3100->dev,
298                         "write error (maskset send address) "
299                         "%d bytes transferred (expected 1)\n",
300                         err);
301                 err = -EIO;
302                 goto get_maskset_unlock;
303         }
304
305         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
306         if (err < 0) {
307                 dev_err(ab3100->dev,
308                         "write error (maskset read register): %d\n",
309                         err);
310                 goto get_maskset_unlock;
311         } else if (err != 1) {
312                 dev_err(ab3100->dev,
313                         "write error (maskset read register) "
314                         "%d bytes transferred (expected 1)\n",
315                         err);
316                 err = -EIO;
317                 goto get_maskset_unlock;
318         }
319
320         /* Modify the register */
321         regandval[1] &= andmask;
322         regandval[1] |= ormask;
323
324         /* Write the register */
325         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
326         if (err < 0) {
327                 dev_err(ab3100->dev,
328                         "write error (write register): %d\n",
329                         err);
330                 goto get_maskset_unlock;
331         } else if (err != 2) {
332                 dev_err(ab3100->dev,
333                         "write error (write register) "
334                         "%d bytes transferred (expected 2)\n",
335                         err);
336                 err = -EIO;
337                 goto get_maskset_unlock;
338         }
339
340         /* All is well */
341         err = 0;
342
343  get_maskset_unlock:
344         mutex_unlock(&ab3100->access_mutex);
345         return err;
346 }
347
348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
349         u8 reg, u8 bitmask, u8 bitvalues)
350 {
351         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
352
353         return ab3100_mask_and_set_register_interruptible(ab3100,
354                         reg, bitmask, (bitmask & bitvalues));
355 }
356
357 /*
358  * Register a simple callback for handling any AB3100 events.
359  */
360 int ab3100_event_register(struct ab3100 *ab3100,
361                           struct notifier_block *nb)
362 {
363         return blocking_notifier_chain_register(&ab3100->event_subscribers,
364                                                nb);
365 }
366 EXPORT_SYMBOL(ab3100_event_register);
367
368 /*
369  * Remove a previously registered callback.
370  */
371 int ab3100_event_unregister(struct ab3100 *ab3100,
372                             struct notifier_block *nb)
373 {
374   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
375                                             nb);
376 }
377 EXPORT_SYMBOL(ab3100_event_unregister);
378
379
380 static int ab3100_event_registers_startup_state_get(struct device *dev,
381                                              u8 *event)
382 {
383         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
384         if (!ab3100->startup_events_read)
385                 return -EAGAIN; /* Try again later */
386         memcpy(event, ab3100->startup_events, 3);
387         return 0;
388 }
389
390 static struct abx500_ops ab3100_ops = {
391         .get_chip_id = ab3100_get_chip_id,
392         .set_register = set_register_interruptible,
393         .get_register = get_register_interruptible,
394         .get_register_page = get_register_page_interruptible,
395         .set_register_page = NULL,
396         .mask_and_set_register = mask_and_set_register_interruptible,
397         .event_registers_startup_state_get =
398                 ab3100_event_registers_startup_state_get,
399         .startup_irq_enabled = NULL,
400 };
401
402 /*
403  * This is a threaded interrupt handler so we can make some
404  * I2C calls etc.
405  */
406 static irqreturn_t ab3100_irq_handler(int irq, void *data)
407 {
408         struct ab3100 *ab3100 = data;
409         u8 event_regs[3];
410         u32 fatevent;
411         int err;
412
413         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
414                                        event_regs, 3);
415         if (err)
416                 goto err_event;
417
418         fatevent = (event_regs[0] << 16) |
419                 (event_regs[1] << 8) |
420                 event_regs[2];
421
422         if (!ab3100->startup_events_read) {
423                 ab3100->startup_events[0] = event_regs[0];
424                 ab3100->startup_events[1] = event_regs[1];
425                 ab3100->startup_events[2] = event_regs[2];
426                 ab3100->startup_events_read = true;
427         }
428         /*
429          * The notified parties will have to mask out the events
430          * they're interested in and react to them. They will be
431          * notified on all events, then they use the fatevent value
432          * to determine if they're interested.
433          */
434         blocking_notifier_call_chain(&ab3100->event_subscribers,
435                                      fatevent, NULL);
436
437         dev_dbg(ab3100->dev,
438                 "IRQ Event: 0x%08x\n", fatevent);
439
440         return IRQ_HANDLED;
441
442  err_event:
443         dev_dbg(ab3100->dev,
444                 "error reading event status\n");
445         return IRQ_HANDLED;
446 }
447
448 #ifdef CONFIG_DEBUG_FS
449 /*
450  * Some debugfs entries only exposed if we're using debug
451  */
452 static int ab3100_registers_print(struct seq_file *s, void *p)
453 {
454         struct ab3100 *ab3100 = s->private;
455         u8 value;
456         u8 reg;
457
458         seq_printf(s, "AB3100 registers:\n");
459
460         for (reg = 0; reg < 0xff; reg++) {
461                 ab3100_get_register_interruptible(ab3100, reg, &value);
462                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
463         }
464         return 0;
465 }
466
467 static int ab3100_registers_open(struct inode *inode, struct file *file)
468 {
469         return single_open(file, ab3100_registers_print, inode->i_private);
470 }
471
472 static const struct file_operations ab3100_registers_fops = {
473         .open = ab3100_registers_open,
474         .read = seq_read,
475         .llseek = seq_lseek,
476         .release = single_release,
477         .owner = THIS_MODULE,
478 };
479
480 struct ab3100_get_set_reg_priv {
481         struct ab3100 *ab3100;
482         bool mode;
483 };
484
485 static ssize_t ab3100_get_set_reg(struct file *file,
486                                   const char __user *user_buf,
487                                   size_t count, loff_t *ppos)
488 {
489         struct ab3100_get_set_reg_priv *priv = file->private_data;
490         struct ab3100 *ab3100 = priv->ab3100;
491         char buf[32];
492         ssize_t buf_size;
493         int regp;
494         u8 user_reg;
495         int err;
496         int i = 0;
497
498         /* Get userspace string and assure termination */
499         buf_size = min(count, (sizeof(buf)-1));
500         if (copy_from_user(buf, user_buf, buf_size))
501                 return -EFAULT;
502         buf[buf_size] = 0;
503
504         /*
505          * The idea is here to parse a string which is either
506          * "0xnn" for reading a register, or "0xaa 0xbb" for
507          * writing 0xbb to the register 0xaa. First move past
508          * whitespace and then begin to parse the register.
509          */
510         while ((i < buf_size) && (buf[i] == ' '))
511                 i++;
512         regp = i;
513
514         /*
515          * Advance pointer to end of string then terminate
516          * the register string. This is needed to satisfy
517          * the kstrtou8() function.
518          */
519         while ((i < buf_size) && (buf[i] != ' '))
520                 i++;
521         buf[i] = '\0';
522
523         err = kstrtou8(&buf[regp], 16, &user_reg);
524         if (err)
525                 return err;
526
527         /* Either we read or we write a register here */
528         if (!priv->mode) {
529                 /* Reading */
530                 u8 regvalue;
531
532                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
533
534                 dev_info(ab3100->dev,
535                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
536                          user_reg, regvalue);
537         } else {
538                 int valp;
539                 u8 user_value;
540                 u8 regvalue;
541
542                 /*
543                  * Writing, we need some value to write to
544                  * the register so keep parsing the string
545                  * from userspace.
546                  */
547                 i++;
548                 while ((i < buf_size) && (buf[i] == ' '))
549                         i++;
550                 valp = i;
551                 while ((i < buf_size) && (buf[i] != ' '))
552                         i++;
553                 buf[i] = '\0';
554
555                 err = kstrtou8(&buf[valp], 16, &user_value);
556                 if (err)
557                         return err;
558
559                 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
560                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
561
562                 dev_info(ab3100->dev,
563                          "debug write reg[0x%02x] with 0x%02x, "
564                          "after readback: 0x%02x\n",
565                          user_reg, user_value, regvalue);
566         }
567         return buf_size;
568 }
569
570 static const struct file_operations ab3100_get_set_reg_fops = {
571         .open = simple_open,
572         .write = ab3100_get_set_reg,
573         .llseek = noop_llseek,
574 };
575
576 static struct dentry *ab3100_dir;
577 static struct dentry *ab3100_reg_file;
578 static struct ab3100_get_set_reg_priv ab3100_get_priv;
579 static struct dentry *ab3100_get_reg_file;
580 static struct ab3100_get_set_reg_priv ab3100_set_priv;
581 static struct dentry *ab3100_set_reg_file;
582
583 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
584 {
585         int err;
586
587         ab3100_dir = debugfs_create_dir("ab3100", NULL);
588         if (!ab3100_dir)
589                 goto exit_no_debugfs;
590
591         ab3100_reg_file = debugfs_create_file("registers",
592                                 S_IRUGO, ab3100_dir, ab3100,
593                                 &ab3100_registers_fops);
594         if (!ab3100_reg_file) {
595                 err = -ENOMEM;
596                 goto exit_destroy_dir;
597         }
598
599         ab3100_get_priv.ab3100 = ab3100;
600         ab3100_get_priv.mode = false;
601         ab3100_get_reg_file = debugfs_create_file("get_reg",
602                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
603                                 &ab3100_get_set_reg_fops);
604         if (!ab3100_get_reg_file) {
605                 err = -ENOMEM;
606                 goto exit_destroy_reg;
607         }
608
609         ab3100_set_priv.ab3100 = ab3100;
610         ab3100_set_priv.mode = true;
611         ab3100_set_reg_file = debugfs_create_file("set_reg",
612                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
613                                 &ab3100_get_set_reg_fops);
614         if (!ab3100_set_reg_file) {
615                 err = -ENOMEM;
616                 goto exit_destroy_get_reg;
617         }
618         return;
619
620  exit_destroy_get_reg:
621         debugfs_remove(ab3100_get_reg_file);
622  exit_destroy_reg:
623         debugfs_remove(ab3100_reg_file);
624  exit_destroy_dir:
625         debugfs_remove(ab3100_dir);
626  exit_no_debugfs:
627         return;
628 }
629 static inline void ab3100_remove_debugfs(void)
630 {
631         debugfs_remove(ab3100_set_reg_file);
632         debugfs_remove(ab3100_get_reg_file);
633         debugfs_remove(ab3100_reg_file);
634         debugfs_remove(ab3100_dir);
635 }
636 #else
637 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
638 {
639 }
640 static inline void ab3100_remove_debugfs(void)
641 {
642 }
643 #endif
644
645 /*
646  * Basic set-up, datastructure creation/destruction and I2C interface.
647  * This sets up a default config in the AB3100 chip so that it
648  * will work as expected.
649  */
650
651 struct ab3100_init_setting {
652         u8 abreg;
653         u8 setting;
654 };
655
656 static const struct ab3100_init_setting ab3100_init_settings[] = {
657         {
658                 .abreg = AB3100_MCA,
659                 .setting = 0x01
660         }, {
661                 .abreg = AB3100_MCB,
662                 .setting = 0x30
663         }, {
664                 .abreg = AB3100_IMRA1,
665                 .setting = 0x00
666         }, {
667                 .abreg = AB3100_IMRA2,
668                 .setting = 0xFF
669         }, {
670                 .abreg = AB3100_IMRA3,
671                 .setting = 0x01
672         }, {
673                 .abreg = AB3100_IMRB1,
674                 .setting = 0xBF
675         }, {
676                 .abreg = AB3100_IMRB2,
677                 .setting = 0xFF
678         }, {
679                 .abreg = AB3100_IMRB3,
680                 .setting = 0xFF
681         }, {
682                 .abreg = AB3100_SUP,
683                 .setting = 0x00
684         }, {
685                 .abreg = AB3100_DIS,
686                 .setting = 0xF0
687         }, {
688                 .abreg = AB3100_D0C,
689                 .setting = 0x00
690         }, {
691                 .abreg = AB3100_D1C,
692                 .setting = 0x00
693         }, {
694                 .abreg = AB3100_D2C,
695                 .setting = 0x00
696         }, {
697                 .abreg = AB3100_D3C,
698                 .setting = 0x00
699         },
700 };
701
702 static int ab3100_setup(struct ab3100 *ab3100)
703 {
704         int err = 0;
705         int i;
706
707         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
708                 err = ab3100_set_register_interruptible(ab3100,
709                                           ab3100_init_settings[i].abreg,
710                                           ab3100_init_settings[i].setting);
711                 if (err)
712                         goto exit_no_setup;
713         }
714
715         /*
716          * Special trick to make the AB3100 use the 32kHz clock (RTC)
717          * bit 3 in test register 0x02 is a special, undocumented test
718          * register bit that only exist in AB3100 P1E
719          */
720         if (ab3100->chip_id == 0xc4) {
721                 dev_warn(ab3100->dev,
722                          "AB3100 P1E variant detected, "
723                          "forcing chip to 32KHz\n");
724                 err = ab3100_set_test_register_interruptible(ab3100,
725                         0x02, 0x08);
726         }
727
728  exit_no_setup:
729         return err;
730 }
731
732 /* The subdevices of the AB3100 */
733 static struct mfd_cell ab3100_devs[] = {
734         {
735                 .name = "ab3100-dac",
736                 .id = -1,
737         },
738         {
739                 .name = "ab3100-leds",
740                 .id = -1,
741         },
742         {
743                 .name = "ab3100-power",
744                 .id = -1,
745         },
746         {
747                 .name = "ab3100-regulators",
748                 .of_compatible = "stericsson,ab3100-regulators",
749                 .id = -1,
750         },
751         {
752                 .name = "ab3100-sim",
753                 .id = -1,
754         },
755         {
756                 .name = "ab3100-uart",
757                 .id = -1,
758         },
759         {
760                 .name = "ab3100-rtc",
761                 .id = -1,
762         },
763         {
764                 .name = "ab3100-charger",
765                 .id = -1,
766         },
767         {
768                 .name = "ab3100-boost",
769                 .id = -1,
770         },
771         {
772                 .name = "ab3100-adc",
773                 .id = -1,
774         },
775         {
776                 .name = "ab3100-fuelgauge",
777                 .id = -1,
778         },
779         {
780                 .name = "ab3100-vibrator",
781                 .id = -1,
782         },
783         {
784                 .name = "ab3100-otp",
785                 .id = -1,
786         },
787         {
788                 .name = "ab3100-codec",
789                 .id = -1,
790         },
791 };
792
793 struct ab_family_id {
794         u8      id;
795         char    *name;
796 };
797
798 static const struct ab_family_id ids[] = {
799         /* AB3100 */
800         {
801                 .id = 0xc0,
802                 .name = "P1A"
803         }, {
804                 .id = 0xc1,
805                 .name = "P1B"
806         }, {
807                 .id = 0xc2,
808                 .name = "P1C"
809         }, {
810                 .id = 0xc3,
811                 .name = "P1D"
812         }, {
813                 .id = 0xc4,
814                 .name = "P1E"
815         }, {
816                 .id = 0xc5,
817                 .name = "P1F/R1A"
818         }, {
819                 .id = 0xc6,
820                 .name = "P1G/R1A"
821         }, {
822                 .id = 0xc7,
823                 .name = "P2A/R2A"
824         }, {
825                 .id = 0xc8,
826                 .name = "P2B/R2B"
827         },
828         /* AB3000 variants, not supported */
829         {
830                 .id = 0xa0
831         }, {
832                 .id = 0xa1
833         }, {
834                 .id = 0xa2
835         }, {
836                 .id = 0xa3
837         }, {
838                 .id = 0xa4
839         }, {
840                 .id = 0xa5
841         }, {
842                 .id = 0xa6
843         }, {
844                 .id = 0xa7
845         },
846         /* Terminator */
847         {
848                 .id = 0x00,
849         },
850 };
851
852 static int ab3100_probe(struct i2c_client *client,
853                                   const struct i2c_device_id *id)
854 {
855         struct ab3100 *ab3100;
856         struct ab3100_platform_data *ab3100_plf_data =
857                 dev_get_platdata(&client->dev);
858         int err;
859         int i;
860
861         ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
862         if (!ab3100) {
863                 dev_err(&client->dev, "could not allocate AB3100 device\n");
864                 return -ENOMEM;
865         }
866
867         /* Initialize data structure */
868         mutex_init(&ab3100->access_mutex);
869         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
870
871         ab3100->i2c_client = client;
872         ab3100->dev = &ab3100->i2c_client->dev;
873
874         i2c_set_clientdata(client, ab3100);
875
876         /* Read chip ID register */
877         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
878                                                 &ab3100->chip_id);
879         if (err) {
880                 dev_err(&client->dev,
881                         "could not communicate with the AB3100 analog "
882                         "baseband chip\n");
883                 goto exit_no_detect;
884         }
885
886         for (i = 0; ids[i].id != 0x0; i++) {
887                 if (ids[i].id == ab3100->chip_id) {
888                         if (ids[i].name != NULL) {
889                                 snprintf(&ab3100->chip_name[0],
890                                          sizeof(ab3100->chip_name) - 1,
891                                          "AB3100 %s",
892                                          ids[i].name);
893                                 break;
894                         } else {
895                                 dev_err(&client->dev,
896                                         "AB3000 is not supported\n");
897                                 goto exit_no_detect;
898                         }
899                 }
900         }
901
902         if (ids[i].id == 0x0) {
903                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
904                         ab3100->chip_id);
905                 dev_err(&client->dev, "accepting it anyway. Please update "
906                         "the driver.\n");
907                 goto exit_no_detect;
908         }
909
910         dev_info(&client->dev, "Detected chip: %s\n",
911                  &ab3100->chip_name[0]);
912
913         /* Attach a second dummy i2c_client to the test register address */
914         ab3100->testreg_client = i2c_new_dummy(client->adapter,
915                                                client->addr + 1);
916         if (!ab3100->testreg_client) {
917                 err = -ENOMEM;
918                 goto exit_no_testreg_client;
919         }
920
921         err = ab3100_setup(ab3100);
922         if (err)
923                 goto exit_no_setup;
924
925         err = devm_request_threaded_irq(&client->dev,
926                                         client->irq, NULL, ab3100_irq_handler,
927                                         IRQF_ONESHOT, "ab3100-core", ab3100);
928         if (err)
929                 goto exit_no_irq;
930
931         err = abx500_register_ops(&client->dev, &ab3100_ops);
932         if (err)
933                 goto exit_no_ops;
934
935         /* Set up and register the platform devices. */
936         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
937                 ab3100_devs[i].platform_data = ab3100_plf_data;
938                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
939         }
940
941         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
942                               ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
943
944         ab3100_setup_debugfs(ab3100);
945
946         return 0;
947
948  exit_no_ops:
949  exit_no_irq:
950  exit_no_setup:
951         i2c_unregister_device(ab3100->testreg_client);
952  exit_no_testreg_client:
953  exit_no_detect:
954         return err;
955 }
956
957 static int ab3100_remove(struct i2c_client *client)
958 {
959         struct ab3100 *ab3100 = i2c_get_clientdata(client);
960
961         /* Unregister subdevices */
962         mfd_remove_devices(&client->dev);
963         ab3100_remove_debugfs();
964         i2c_unregister_device(ab3100->testreg_client);
965         return 0;
966 }
967
968 static const struct i2c_device_id ab3100_id[] = {
969         { "ab3100", 0 },
970         { }
971 };
972 MODULE_DEVICE_TABLE(i2c, ab3100_id);
973
974 static struct i2c_driver ab3100_driver = {
975         .driver = {
976                 .name   = "ab3100",
977                 .owner  = THIS_MODULE,
978         },
979         .id_table       = ab3100_id,
980         .probe          = ab3100_probe,
981         .remove         = ab3100_remove,
982 };
983
984 static int __init ab3100_i2c_init(void)
985 {
986         return i2c_add_driver(&ab3100_driver);
987 }
988
989 static void __exit ab3100_i2c_exit(void)
990 {
991         i2c_del_driver(&ab3100_driver);
992 }
993
994 subsys_initcall(ab3100_i2c_init);
995 module_exit(ab3100_i2c_exit);
996
997 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
998 MODULE_DESCRIPTION("AB3100 core driver");
999 MODULE_LICENSE("GPL");